Abrading machine



July 20, 1937. c, G BRQSTROM 2,087,238

ABRADING MACHINE Filed Feb. 11, 1935 2 Sheets-Sheet 1 I80 Fig.1.

July 20, 1937. c. e. BROSTRO M ABRADING MACHINE Filed Feb. 11, 1935 2 Sheets-Sheet 2 m 2 F. M :1 z m ail A: v M W l F M w W m .w F

Patented July 20, 1937 UNETED STATES mews ABRADING MACHINE Charlies G. Brostrom, Peabody, Mass, assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application February 11, 1935, Serial No. 5,897

9 Claims.

This invention relates to abrading machines and is herein illustrated as embodied in a machine for roughing channels and channel flaps formed in shoe parts to facilitate the cementing of the fiaps to the channels. The illustrated machine is of the type disclosed in United States Letters Patent No. 2,004,109 granted June 11, 1935 upon the application of John B. Hadaway, and, like the machine disclosed in that patent,

comprises scouring elements for operating upon the inner surface of the flap and upon the channel respectively, a gage for assuring proper presentation of the shoe to the scouring elements, and a member for pressing the fiap against one 2 of the scouring elements.

It is-an object of the present invention to pro-- vide an improved machine of the; type above indicated.

In accordance with a feature of the invention,

. the securing elements of the illustrated machine are both frusto-conical in form. This construction enables the operator to prese'ntthe shoe to the scouring elements by direct upward-pressure without requiring him to exert a side pressure upon the shoe tohold it in contact with a gage. In the herein disclosed preferred embodiment of the invention, the scouring elements consist of frusto-conical wire brushes between which extends a gage in the form of a thin blade-like .30 member which is adapted to engage the surface of the channel at the base of. the flap to position the sole for presentation of the inner surface of the channel flap to one of the scouring brushes and for presentation of the surface of the chan '35 nel to the other scouring brush.

In accordance with a furtherfeature, a guard is provided for preventing the. bristles of the brush which operates upon the channel from damaging the upper of the shoe. As illustrated,

40 this: guard is positioned closely adjacent to the scouring brush and has a frusto-conical work engaging surface which is substantially a continuation of the work-engaging surface of the brush.

4.5 The machine illustrated and described in this application is provided with an arrangement for sharpening or dressing the bristles of a scouring brush. In accordance with a feature of the present invention, the machine illustrated herein 50 comprises, in addition to'the mechanism for driving the operating tool at a, normal operating speed, means for driving the roughing tool at a greater than normal speed to facilitate dressing the roughing tool. The illustrated construction 31: includes a device for dressing the roughingtool,

the c lumn l2 above the motor is a bracket 5;)

which device normally occupies an inoperative position from which it may be moved into engagement with the roughing tool, and which is pivotally mounted in such a manner as to enable it to be presented in definitely determined angu- 5 lar relations to the roughing tool. By reason of such pivotal mounting, the dressing tool may be presented in proper angular relation first to one of the frusto-conical roughing elements and then to the other frusto-conical roughing ele- 10 ment.

These and other features of the invention, including certain details of construction and combinations of parts, will be described in combination with the illustrated machine and pointed 15 out in the appended claims.

Referring now to the accompanying drawings:

Fig; 1 is a View in front elevation of a machine in which the present invention is embodied;

Fig. 2 isa View in end elevation of a portion 20 of the machine shown in Fig. 1 with the outer scouring brush removed;

Fig. 3 is a view in perspective of portions of the machine;

Fig. 4 is a plan view of certain parts shown in l 5 F l v Fig. 5 is a 'viewin front elevation of the scouring elements of the: machine in operation upon a shoe; and

Fig. 6 is an enlarged view in front elevation 30 of a portion of the machine illustrated in Fig. 1. The supporting structure of the machine con-- sists of a hollow frame til adapted to rest upon the floor and to support an upwardly extending column l2 which carries a head 14. Supported by the head 14 are a pair of bearings IS in which is journaled a shaft l8. Upon the outer end of the shaft I8 is mounted a scouring tool comprising a tool body.- I9 upon which are mounted a pair of frusto-conical wire scouring brushes 20 and 22 which are positioned side by side along the axis of the tool and which have their large ends adjacent to each other but spaced apart a slight distance for a purpose which will later be explained. Secured upon the shaft I8 is a pulley 24. On one side of the fixed pulley is an idler pulley 26 and on the opposite side is another idler pulley 28, A guard 29 for the pulleys 24, 26 and 28 is supported between the bearings it.

Mounted upon the lower portion of the frame I0 is a motor 30 upon the shaft of which is mounted a relatively large pulley 32 and a smaller pulley 34. The idler pulley 28 is constantly driven from the pulley 32 by a belt 36. Secured upon from the operation on the scouring tool.

' a relatively sharp edge.

38 having bearings in which is journaled a shaft 46. Secured upon the shaft 46 is a pulley 42 which is relatively large as compared with the pulley 34. The pulley 42 is driven from the pulley 34 by a belt 44. Also secured upon the shaft 46 is a pinion 46. Journaled in bearings in the bracket 38 is a shaft 48 upon which is secured a pulley 56 and a gear 52. The gear. 52 is in mesh with and is driven by the pinion 46. A belt 54 from the pulley 56 drives the idler pulley 26. Supported upon the bracket 38 is an air pump 56 which is driven by the shaft 46, and which has a screened cylindrical air inlet 51. It will be apparent that by reason of the above described construction the idler. pulley 28 will be constantly driven at relatively high speed while the idler pulley 26 will be constantly driven in the opposite direction at a much less speed. Supported by the head I4 is a belt shifter 58 for shifting the belt 36 between the idler pulley 28 and the pulley 24 which is fixed upon the shaft I8. A similar belt shifter 66 is provided for the belt 54 for shifting the latter between the idler pulley 26 and the fixed pulley 24. These belt shifters are employed not only for the purpose of starting and stopping the drive of the shaft I8 but also to control the direction and speed of the shaft, the shaft I8 being driven at a relatively slow operating speed by the belt 54, and at a much faster speed and in the reverse direction by the belt 36 when it is desired to sharpen the securing elements above mentioned.

Supported by lugs extending from the bearings I6 are a pair of horizontal rods 62 and 64 upon which is mounted a dust hood 66 having a suction outlet 68 for disposing of the dust which results Extending upwardly from the pump 56 is a pipe I6 to which is connected a flexible extension I2 terminating in a blast nozzle 14 which is directed against the locality of operation of the scouring elements upon the work toprevent dust from adhering to the work. The extension 14 is supported by a clamp I mounted on a boss 11 formed on the hood 66.

The rod 62 extends within the dust hood 66 and.

supports a bracket I6 (Figs. 2 and 3) which is secured to the rod 62 for. lengthwise adjustment thereon by the set screw I8. Formed in the bracket I6 are a pair of horizontal guideways-86 and 82 respectively. A block 84 is slidably mounted in the guideway 86 for adjustment forwardly and rearwardly with respect to the shaft I8 and is secured in adjusted position by a clamping bolt 86 which passes through a slot 88 in the block 84. Formed in the block 84 is a vertical guideway in which is slidably mounted a gage member 96. A clamping bolt 92 which passes through a slot 94 in the gage 96 enables the gage 96 to be secured in a desired position of vertical adjustment with respect to the shaft I8. The gage 96 extends downwardly from the block 84 and consists of a relatively thin blade-like member which extends between the scouring elements 26 and 22, and the lower portion of which is arcuate in form, having a curvature which is similar to that of the adjacent portions of the scouring elements 26 and 22. The curved portion of the gage 96 terminates. rearwardly of the vertical center line and below the horizontal center line of the shaft I8. As indicated by the reference character 96 in Fig. 3, the gage 96 is beveled to provide This edge engages the angle between the channel, as shown in Fig. 5, and the base of the flap F to control the position of a shoe relatively to the scouring elements. Slidably mounted in the guideway 82 for adjustment forwardly and rearwardly with respect to the shaft I8 is a block 98. A clamping bolt I66 which passes through a slot I62 in the block 98 enables the latter to be secured in adjusted posi tion. Slidably mounted upon the block 96 for vertical adjustment is a block I64. A clamping bolt I66 passes through a slot I68 in the block I64 for securing the latter in adjusted position. Slidably mounted in the block I64 for adjustment in a direction parallel tothe shaft I8 is a guard H6. A clamping bolt II2 which passes through a slot H4 in the guard H6 enables the latter to be clamped in a desired position of adjustment relatively to the gage 96 in the direction of the axis of the shaft I8. As illustrated in Figs. 3 and 5, the guard H6 has a frusto-conical work engaging surface which curves downwardly and rearwardly to about the vertical center line of the shaft I8. As shown more particularly in Fig. 5, the frusto-conical work engaging surface of the guard H6 is substantially a continuation of the operating surface of a portion of the scouring brush 22. The guard H6 is adjusted lengthwise of the shaft I8 to bring it closely adjacent to the scouring element 22.

For holding the channel flap against the scouring brush 26 there is provided a frusto-conical idler roll I I6 which is journaled for free rotation upon a reduced outer end of a pin I I8. The pin H8 is clamped in a block I26 carried by an arm I22 which is pivotally mounted by a pin I24 upon the bracket I8. In the illustrated construction the block I26 and the arm I22 are integral, the block being in the form of a split socket in which the pin I I8 is clamped by a screw I25. The arm I22 is provided with a bell crank extension I26. Secured upon the rods 62 and 64 is a bracket I28 upon which is pivotally mounted by a pin I36 a bell crank comprising a pair of arms I32 and I34. A link I36 connects the arms I34 and I26. Extending downwardly from the arm I32 is a rod I38, the lower end of which is connected to a treadle I46 which is fulcrumed in the lower portion of the frame I6. Carried by the arm I34 is a casing I42 into which extends an end portion of a compression spring I44 which bears against a plug I46 threaded intothe end of the casing I42 and by means of which the degree of compression of the spring may be adjusted. The opposite end of the spring I44 extends within and bears against the inner end of a recess formed in the bracket I28. It will be observed that by reason of the construction above described the spring I44 serves normally to urge the frustoconical presser roll H6 toward the scouring brush 26, while depression of the treadle I46 withdraws the pressure roll from the vicinity of the scouring tool to facilitate the insertion of work. The approach of the presser roll toward the scouring tool is limited by an adjustable stop screw I48 which is threaded in the bracket I28 and which bears against the bell crank arm I32.

Formed upon the upper surface of the dust hood 66 is a boss I56 into which is threaded an end of an upstanding pin I52 upon which is pivotally mounted a bracket I54. The axis of the pin I52 is substantially tangent to a circle which is coaxial with the shaft I8 and which is equal in diameter to the circles representing the larger ends of the brushes 26 and 22 respectively. The foot of the bracket I54 rests upon the boss I56 and has an extension in which is formed an arcuate slot I56 concentric with the pin I52.

A clamping bolt I58 extends upwardly through an opening in the boss I50 and through the slot I56. A thumb nut I60 threaded upon the bolt I58 enables the bracket I50 to be secured against rotation about the pin I52. Extending upwardly from the bracket I54 is an arm I62 on which is formed a boss I 64 for a pin I66 upon which is pivotally mounted a bracket I68. Secured within the bracket I68 by a set screw I is a 1Q pin I12 upon which is pivotally mounted an arm I14. In the other end of the arm I14 is formed a bearing I16 for a rotatable bushing I18 in which is carried an abrading element, for example a rectangular block of carborundum I80. The normal or inoperative position of the arm I14 is shown in solid lines in Fig. 2 with the arm I14 resting upon a support I82 which extends from the arm I62 and which is provided with a V-shaped notch to receive the arm I14. 20 When the dressing tool I80 is to be used, the bracket I68 is swung about the axis of the pin I 66 from the full line position shown in Fig. 2

, until the bracket I68 is substantially horizontal. The arm I14 is then substantially upright, whereupon it is swung downwardly about the pin I12 until the bearing I16 is in its low position. The thumb nut I60 is then loosened and the bracket I54 is rotated about the pin I52 to the position indicated by dash lines, that is, un- 3 til one end of the slot I56 engages the bolt I58.

In this position the face of the block I80 is adjacent to the conical face of one of the brushes and preferably extends therebeyond in the direction of the other brush a distance substantially equal to the face of the other brush as will be apparent from Fig. 1 and from the dotted showing of Fig; 2. The slot I56 is so designed that when the bracket is in this position the end of the carborundum block I80 will be in proper angular relation to the axis of the scouring tool for engagement with one of the scouring brushes. The operator then presses the block I80 toward the scouring tool, rotating the bushing I18 by hand to distribute the wear upon the end surface of the carborundum block and swinging the arm I14 about the pin I12. The swinging of the arm I14 about the pin I12 contributes to the distribution of the wear on the end surface of the carborundum block and, in addition, it permits the use of a block of less width than above indicated. The approach of the block toward the scouring tool is adjustably limited by a screw I83 which is threaded through the arm I82 and which bears against the bracket I68. After thus sharpening one of the frusto-conical brushes, the operator swings the bracket I54 about the pin I 52 until the opposite end of the slot I56 engages the bolt I58. The dressing tool is thus positioned in its proper relation for sharpening the other frusto-conical scouring brush.

As already stated, the axis about which the bracket I54 is pivoted is substantially tangent to a circle coaxial with the scouring brushes and equal in diameter to the adjacent large ends of 'the scouring brushes. The swinging of the bracket to present the dressing tool first to one brush and then to the other will not, therefore, grind off the corners of the large ends of the brushes. As the brushes diminish in diameter, in the course of repeated sharpening, the screw I33 will be turned to advance the dressing tool accordingly; and the axis of the bracket I54 will come somewhat outside of the circle above mentioned, so that there will still be no danger of grinding off the corners of the large ends of the scouring brushes.

To operate the machine the motor is started and the belt 54 is shifted from the idler pulley 26 to the fixed pulley 24. The scouring tool is thereby driven at a speed, for example, of about 300 revolutions per minute in a direction indicated by the arrow N on Fig. 2, which is the normal or operating direction of drive. The treadle I is then depressed and the flap of a channel is inserted between the presser roll H6 and the scouring brush 20. The treadle is then released enabling the spring I44 to cause the roll I I6 to press the channel flap against the scouring tool 20. In Fig. 5 is shown a portion of a shoe having a channel flap F and a channel having a surface S from which the flap F has been cut, with the inner surfaceoftheflapF in engagement with the scouring tool 20 and with the channel surface S in engagement with the scouring tool 22. As shown in Fig. 5, the gage 96 engages the channel at the base of the flap F. The operator presents the shoe with the toe end pointing toward him and begins at the end of the channel, holding the shoe in the gaged position above described and feeding it away from himself. The direction of rotation, indicated by the arrow N on Fig. 2, is such as to assist in the feeding of the shoe. The operator, in feeding the shoe, turns it in accordance with the curvature of the outline of the sole, continuing the operation until the opposite end of the channel is reached. When he finishes the operation the toe end of the shoe will be pointing away from him.

The guard I I0 serves to protect the upper of the shoe indicated by the reference character U in Fig. 5. The section of the shoe shown in Fig.

5 is taken at the inside of the shank, at which portion the upper U extends outwardly almost as a continuation of the channeled margin of the sole. Inasmuch as the bristles of the scouring brush 22 tend to spread under the pressure of the work, there would be danger of these bristles scratching the upper of the shoe at this locality if it were not for the guard H0.

When it is desired to sharpen the brushes 20 and 22, the belt 54 is shifted back to the idler pulley 26 and the belt 36 is shifted from the idler pulley 28 to the fixed pulley 24 thereby driving the brushes 20 and 22 at a much greater speed (for example, about 4200 revolutions per minute) in the reverse direction, indicated by the arrow B on Fig. 2. The dressing tool is then manipulated in the manner already described. The effect of rotating the scouring brushes at high speed in the opposite direction while in engagement with the dressing tool is to raise a burr on the tip of each of the bristles, greatly increasing their effectiveness for operations.

Having described my invention, what I claim the roughing as new and desire to secure by Letters Patent of the United States is:

1. A machine for securing channels and channel flaps formed in shoe soles, comprising a shaft, a tool on said shaft comprising a pair of frustoconical scouring elements, and a gage engageable with a channeled sole to aid in positioning the sole for presentation of the inner surface of the channel flap to one of said scouring elements and for presentation of the surface at the bottom of the channel to the other scouring element.

2. A machine for scouring channels and channel flaps formed in shoe soles, comprising a shaft, a tool on said shaft comprising a pair of frustoconical wire. scouring brushes, and a gage engageable with the angle between the base of a channel flap and the bottom surface of the channel of a channeled sole to aid in positioning the sole for presentation of the inner surface of the channel flap to one of said scouring brushes and for presentation of the surface of the bottom of the channel to the other scouring brush.

3. A machine for scouring channels and chan- 1 nel flaps formed in shoe soles, comprising a shaft,

a tool on said shaft comprising a pair of frustoconical wire scouring brushes, and a stationary gage in the form of a thin blade-like member extending between said brushes and adapted to engage the angle. between the base of a channel flap and the bottom surface of the channel of a channeled sole to aid in positioning the sole for presentation of the inner surface of the channel flap to one of said scouring brushes and for presentation of the surface of the bottom of the channel to the other scouring brush.

4. A tool for scouring channels and channel flaps formed in shoe soles, comprising a rotary tool body, and a pair of frusto-conical wire scour- -ing brushes carried by said tool body, said brushes having their large ends adjacent to each other but separated by a slight space to accommodate a gage between them.

5. A machine for scouring channels formed in 3O shoe soles, comprising a rotary driven wire scouring brush for scouring a channel of the sole of a shoe, and a guard adjacent to the brush for preventing the bristles of the brush from damaging the upper of the shoe.

5 35 6. A machine for scouring channels formed in shoe soles, comprising a rotary driven scouring brush for scouring the channel of the sole of a shoe, and a stationary guard closely adjacent to said brush and having a work-engaging surface whichis substantially a continuation of a portion of theoperating surface of said brush to prevent the bristles of the brush from damaging the upper of the shoe.

7. A machine for scouring channels formed in shoe soles, comprising a rotary frusto-conical driven scouring brush for scouring the channel of the sole of a shoe, and a guard closely adjacent to said scouring brush and having a frusto-conical work engaging surface which is substantially a continuation of a portion of the operating surface of said brush to prevent the bristles of the brush from damaging theupper of the shoe.

8. In a machine for roughing shoe parts, a pair of rotary driven frusto-conical scouring brushes, a dressing tool for said brushes, and a support for said dressing tool pivotally mounted for movement about an axis which is. substantially tangent to a circle coaxial with the scouring brushes and equal in diameter to the adjacent ends of the scouring brushes to enable said dressing tool to be presented in proper angular relation first to one of said brushes and then to the other brush.

9. In a machine for roughing shoe parts, a pair of frusto-conical scouring brushes, the large diameters of said brushes being adjacent to each other, a dressing tool for said scouring brushes, a support for said dressing tool pivotally mounted for movement about an axis which is substantially tangent to a circle coaxial with the. scouring brushes and equal in diameter to the adjacent ends of the scouring brushes, and means for limiting the pivotal movement of said support to determine the angular relation of presentation of said dressing tool to each of said scouring brushes.

CHARLES G. BROSTROM. 

